EP0824618B1 - Sections de sechage d'une machine a papier, permettant un calandrage intermediaire - Google Patents

Sections de sechage d'une machine a papier, permettant un calandrage intermediaire Download PDF

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Publication number
EP0824618B1
EP0824618B1 EP97904468A EP97904468A EP0824618B1 EP 0824618 B1 EP0824618 B1 EP 0824618B1 EP 97904468 A EP97904468 A EP 97904468A EP 97904468 A EP97904468 A EP 97904468A EP 0824618 B1 EP0824618 B1 EP 0824618B1
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EP
European Patent Office
Prior art keywords
calendering
nip
dryer section
nkp
drying
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Expired - Lifetime
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EP97904468A
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German (de)
English (en)
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EP0824618A1 (fr
Inventor
Antti Kuhasalo
Juha Kaihovirta
Allan Liedes
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Metso Paper Oy
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Metso Paper Oy
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Priority to EP01129060A priority Critical patent/EP1195464A3/fr
Publication of EP0824618A1 publication Critical patent/EP0824618A1/fr
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Publication of EP0824618B1 publication Critical patent/EP0824618B1/fr
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/006—Calenders; Smoothing apparatus with extended nips

Definitions

  • the invention concerns a dryer section of a paper machine according to the preamble of claim 1.
  • single-wire draw or twin-wire draw or various combinations of same are employed.
  • single-wire draw either so-called normal groups with single-wire draw are used, in which the drying cylinders are placed in the upper row and the reversing suction cylinders or roils in the lower row, in which case the dryer section is open towards the bottom, for example, in view of removal of broke.
  • inverted groups with single-wire draw the drying cylinders are placed in the lower row and the reversing suction cylinders or rolls in the upper row, in which case it is a drawback that the inverted groups are closed towards the bottom and, for example, removal of broke is associated with problems, because it cannot be arranged to take place by the force of gravity.
  • Fig. 5 in said US Patent 5,127,168 an arrangement is illustrated in which the first nip of intermediate calendering is formed in connection with the first cylinder in the first group with twin-wire draw in a multi-cylinder dryer, and a water-receiving felt of the press section of the paper machine is passed through this first nip of intermediate calendering.
  • the second nip of intermediate calendering is formed in connection with the first lower cylinder in the second group with twin-wire draw.
  • FIG. 1 of said DE Pat. Appl. 4,407,405 an arrangement of intermediate calendering is illustrated in which a nip of intermediate calendering is fitted in connection with the last drying cylinder in an inverted group with single-wire draw.
  • the arrangement of intermediate calendering in accordance with the DE Patent Application involves the drawback that the group gaps in which intermediate calendering is applied become relatively long and spacious in the machine direction and thereby increase the length of the dryer section in the machine direction.
  • an arrangement of intermediate calendering is described to be applied in connection with an inverted group with single-wire draw and in group gaps between such an inverted group and a normal group with single-wire draw only.
  • the EP Patent Application 0 672 783 A2 discloses in its Fig. 3 a dryer section in which a nip of intermediate calendering is formed in connection with the last drying cylinder of a group with single-wire draw.
  • the paper web is arranged to partially envelop both the drying cylinder and the calender roll that form the calendering nip.
  • Another nip of intermediate calendering is formed in a group gap between a group with single-wire draw and a group with twin-wire draw by means of two calender rolls. Both arrangements of intermediate calendering described in the EP application need a lot of space and, therefore, increase the length of the dryer section.
  • the object of the present invention is to provide novel applications for intermediate calendering taking place inside the dryer section, which intermediate calendering in itself involves a number of obvious and well-known advantages.
  • the present invention is mainly characterized by the characterized part of claim 1.
  • the intermediate calendering can be arranged inside the dryer section without increasing the length of the dryer section and while substantially not lowering the drying capacity of the dryer section and while, at the same time, retaining the draw of the web so that the runnability of the paper machine remains good.
  • extended nips in themselves known, either extended nips provided by means of a press shoe, series of shoes, or by means of a press belt, which nips are known in themselves in calendering of paper.
  • EP publications 0,370,185 B1 and 0,141,614 A1 as well as to the published DE Pat. Appl. 43,22,876 A1.
  • the advantage is also obtained that, besides an adequate calendering effect, the profile of the nip pressure can be controlled both in the machine direction and in the cross direction.
  • Figure 1 shows an embodiment of the invention in which the breaker stack is placed in connection with the last drying cylinder in the last normal group with single-wire draw in the dryer section.
  • Figure 1A shows such a modification, included in the scope of the present invention, of the embodiment shown in Fig. 1 in which the nip of intermediate calendering is placed inside a group with single-wire draw.
  • Figure 2 shows another embodiment of the invention in which the breaker stack is placed between two successive groups with single-wire draw.
  • Figure 2A shows an arrangement of intermediate calendering which is in the other respects similar to that shown in Fig. 2, except that in Fig. 2A an extended nip is used as the nip of intermediate calendering.
  • Figure 2B shows such a modification of the arrangement of intermediate calendering shown in Fig. 2 in which the nip of intermediate calendering is preceded by a web heating device, such as a steam box, which promotes the calendering effect.
  • a web heating device such as a steam box
  • Figure 3 shows a variation of the embodiment as shown in Fig. 2.
  • Figure 4 shows a dryer section in which the breaker stack is placed at the end of the last group with single-wire draw in the dryer section, which group is further followed by one group with twin-wire draw.
  • the dryer section shown in Fig. 4 does not form part or the invention.
  • FIG. 5 shows another embodiment of the invention.
  • Fig. 1 shows the final end, i.e. the dry end, of a dryer section consisting of a number of drying groups, preferably exclusively single-wire groups.
  • the paper web W to be dried is passed from the preceding group with single-wire draw R V-1 to the last group with single-wire draw R V .
  • the groups with single-wire draw comprise steam-heated smooth-faced 20' drying cylinders 20,20a in the upper row and reversing suction cylinders 30 or rolls, which are placed in the lower row.
  • the reversing suction cylinders 30 or equivalent communicate with a source of vacuum through their axle journals and are provided with perforated and grooved mantles 31, through which the vacuum present in the interior of the cylinders 30 acts upon the web W through the drying wire 21 and keeps the web W in contact with the drying wire 21 against the effects of various forces applied to the web and arising from centrifugal forces and blowings. In this way, web W breaks and excessive shrinkage of the web in the direction of the plane of the web, especially in the cross direction, are prevented by keeping the web W in reliable contact with the drying wire 21 over the entire length of the dryer section.
  • the web W arrives from the last cylinder 20 in the preceding group R V-1 onto the drying wire 21 of the last group R V .
  • the drying cylinders 20 are provided with drives 25 and doctors 23, which keep the smooth faces 20' of the cylinders 20 clean.
  • a nip NK for intermediate calendering of the web W to be dried has been arranged, which nip NK has been formed between the smooth face 20' of the drying cylinder 20a and the calender roll 10, which is preferably provided with a soft coating 10'.
  • the diameter D K of the calender roll 10 is preferably about half the diameter D 0 of a drying cylinder.
  • Fig. 1A shows an arrangement of intermediate calendering in which the nip NK of intermediate calendering is placed inside a group with single-wire draw R n .
  • a guide roll 22AA for the drying wire 21 has been fitted above one or several drying cylinders 20a, by means of which guide roll the drying wire 21 is passed as straight runs 21' and 21" apart from the drying cylinder 20a and from the paper web W.
  • a calender roll 10 Inside the wire runs 21' and 21" and underneath the guide roll 22AA, a calender roll 10 has been arranged, whose smooth face 10' forms said nip NK of intermediate calendering together with the drying cylinder 20a placed below said calender roll.
  • the construction and the operation are similar to those described above in connection with Fig. 1.
  • a calendering nip NK between the groups R n and R n-1 with single wire draw in accordance with Fig. 2, in which, in connection with the last cylinder 20a in the preceding group with single-wire draw R n-1 , the drying wire 21 is guided by the guide roll 22a so, and the guide roll 22b in the latter group R n is placed so, that the latter upper quarter of the drying cylinder 20a remains free in such a way that an intermediate calender roll 10 can be placed on said quarter, which roll 10 forms a calendering nip NK with the drying cylinder 20a.
  • the intermediate calendering nip NK can be placed favourably so that the web W constantly has a closed draw before and after the calendering nip NK, and so that the overall length of the dryer section is not increased at all.
  • the construction of the dryer section is similar to that described above in relation to Fig. 1 or 1A.
  • Fig. 2A shows such a modification of the arrangement of intermediate calendering as shown in Fig. 2 in which the calender roll 10 has been substituted for by an extended-nip roll 10P, which forms an extended calendering nip NKP with the drying cylinder 20a.
  • the extended-nip roll 10P has a flexible hose mantle 10P', which has closed vertical ends at both sides. Inside the hose mantle 10P', there is a hydraulically loaded glide shoe or a series 27 of glide shoes, which forms an extended calendering nip NKP with the drying cylinder 20a.
  • the length of the calendering nip NKP in the direction of progress of the web W is, as a rule, of an order of 100...300 mm.
  • the extended-nip roll 10P for example, an extended-nip roll marketed with the applicant's trade mark Sym-BeltTM is used, which roll has been applied previously mainly in press sections of paper machines.
  • the guide rolls 22ap and 22b of the drying wires 21 in the groups R n-1 , R n are placed so that a sufficient space remains for the extended-nip roll 10P of relatively large diameter and for its couplings in connection with and above the drying cylinder 20a.
  • the diameter of the extended-nip roll 10P is, for example, of the same order as the diameter of the drying cylinders 20,20a.
  • an extended nip NKP is employed, a particularly efficient calendering effect is obtained.
  • an extended nip NKP is employed, by means of a series 27 of glide shoes, it is possible to control the nip-pressure profile of the calendering zone both in the cross direction and in the machine direction in a way in itself known.
  • Fig. 2B shows such a modification of the arrangement of intermediate calendering as shown in Fig. 2 in which, above the drying cylinder 20a, before the calendering nip NK, a particular device 28 has been fitted, by whose means the calendering effect in the following nip NK is promoted.
  • the guide roll 22ap of the drying wire 21 is placed in a position suitable for this purpose.
  • the device 28 is, for example, a steam feed box, an infrared heater, or equivalent, by whose means the temperature of the web W is raised at the side of its free upper face, whereby the calendering effect is enhanced directly after the device 28 in the nip NK.
  • the device 28 in connection with the device 28, there may be water-mist spray devices or equivalent, by whose means the calendering effect is promoted in the nip NK.
  • the device 28 is arranged so that its position can be regulated, which is illustrated by the arrow S. By means of the regulation S, it is possible to affect the extension of the contact-free treatment gap 29 of the device 28 above the web W and possibly also the efficiency of the heat treatment.
  • the heating device 28 or an equivalent second heating device can also be arranged in connection with the face of the calender roll 10 so as to enhance the calendering effect in the nip NK.
  • Fig. 2B also shows a heating and/or profiling device 28' placed underneath a reversing suction cylinder 30, which device treats the web W through a contact-free treatment gap 29' from the side of the face opposite in relation to the effect of the device 28.
  • Fig. 3 shows a variation of the embodiment of a breaker stack as shown in Fig. 2.
  • the groups R n-1 and R n with single-wire draw have been arranged in the way shown in Fig. 2, and a particular calendering belt 11 has been arranged to run vertically around the calender roll 10 while guided by the guide roll 12, so that the calendering belt 11 runs through the calendering nip NK.
  • the calender roll 10 and/or the guide roll 12 may be provided with a drive, so that, if necessary, in the calendering nip NK the calendering effect can be enhanced by means of a difference in speed between the web W and the outer face of the belt 11, which is in itself known.
  • the calendering effect can also be varied by using calendering bands or belts 11 of different compressibilities. Even though a calendering belt 11 is shown in this embodiment only, it can be used in accordance with the invention also in other positions of breaker stacks inside a dryer section. It is characteristic of the belt 11 that it has a smooth face placed facing the paper. The tendency of paper to follow the belt 11 face is preferably inferior to its tendency to follow the face of a cylinder or calender roll at the nip NK.
  • the twin-wire group R 2W comprises two rows of steam-heated drying cylinders 20A and 20B.
  • the group R 2W there is an upper wire 21A and a lower wire 21B.
  • the upper wire 21A is guided by the guide rolls 22A and by the guide rolls 24A placed in the gaps between the drying cylinders 20A.
  • the lower wire 21B is guided by the guide rolls 22B and by the guide rolls 24B placed in the gaps between the drying cylinders 20B.
  • the web W has free unsupported draws W p .
  • the group R 2W is placed in the final end of the dryer section, especially with thicker grades the web W is sufficiently strong to endure the free draws W p and the fluttering of the web W occurring on said draws.
  • the group R V with single-wire draw preceding the group R 2W with twin-wire draw is provided with drying cylinders 20 placed in the upper row and with small-diameter reversing suction rolls 30aa placed in the lower row.
  • the last drying cylinder 20a in the group R V there is a nip NK for intermediate calendering of the web W to be dried, which nip NK is fitted in accordance with the second embodiment of the invention and which is placed on the latter lower quarter of the drying cylinder 20a.
  • the web W follows the smooth face 10' of the calender roll 10 and is transferred on the roll 10 onto the lower wire 21B of the group R 2W with twin-wire draw, which wire is in contact with the latter lower quarter of the calender roll on a small transfer sector TS while guided by its nearby guide roll 22B.
  • a suction box 26 is employed. After this, the web W is transferred over the heated face 20' of the first lower cylinder 20B in the group R 2W and further, as a free draw W p , onto the first upper cylinder 20A.
  • Fig. 5 shows such a modification of the dryer section shown in Fig. 4 in which the nip NK of intermediate calendering is placed in the vicinity of the horizontal plane passing through the centre of rotation of the last upper cylinder 20a in the last group R V with single-wire draw so that, after the calendering nip NK, the web W has a downward vertical first free draw W p1 .
  • a calendering nip NK' is used which is fitted in connection with the first lower cylinder 20B in the group R 2W with twin-wire draw and which is formed together with the calender roll 10".
  • the embodiment of the invention shown in Fig. 5 is best suitable for thicker paper grades, which endure the free draws W p1 ,W p , of which the first draw W p1 is, as is shown in Fig. 5, already placed directly after the calendering nip NK.
  • the calender roll 10 of the nip NK or nips NK,NK' of intermediate calendering can be a calender roll provided with a hard coating 10' or with a soft coating.
  • the cross-direction distribution of the nip pressure in the calendering nip NK or nips can be arranged to be profiled in a way in itself known by means of a technique known from calenders, for example, by adjusting the cross-direction temperature profile of the roll 10 or of the opposite drying cylinder 20a and/or of the calender roll 10 by means of an induction heating device or by using a calender roll 10 adjustable in zones, for example the applicant's Sym ZS roll.
  • An extended nip NKP of intermediate calendering as shown in Fig. 2A can also be used in the positions of the calendering nip NK shown in Figs. 3 to 5 for which it is suitable in view of the utilization of space or other circumstances.
  • a heat treatment device 28 enhancing the calendering effect and/or an equivalent profiling device, such as a steam box or an infrared heater, as shown in Fig. 2B also in other positions besides that shown in Fig. 2B, of course, in consideration of the need to increase the calendering effect, the utilization of space, and of other practical circumstances.
  • the treatment device 28' whose effect is applied through the treatment gap 29' to the lower face of the web W, i.e. to the face opposite to the face of the effect of the device 28.
  • the surface material of the calender roll 10;10P is chosen so that the face of the calender roll 10 attempts to reject the web W.
  • a number of the nips NK of intermediate calendering described above can be fitted in the different positions described above, and then, in the same dryer section, it is possible to apply different combinations of the locations and arrangements of the calendering nips NK;NKP in accordance with the different embodiments of the invention.
  • 1...3 nips NK of intermediate calendering are used, which are preferably fitted in the dry end of the dryer section, preferably in an area in which the dry solids content of the web W is ka > 60 %.
  • the linear load in the calendering nip NK;NKP depends on the position of the calendering nip NK;NKP, on the thickness and dry solids content of the web W passing through the calendering nip NK;NKP, and on the paper grade produced.
  • the linear load in a calendering nip NK is chosen in the range of 0...300 kN/m, preferably in the range of 0...80 kN/m.
  • a raised temperature also promotes the "ironing effect" of calendering.
  • a level of surface temperature T ⁇ 60...250°C is used, which is produced by means of normal steam heating of the drying cylinder concerned.
  • the drying cylinder in connection with which a calendering nip NK;NKP is placed is provided with separate regulation of the temperature, which regulation can, if necessary, also be profiled in view of control of the cross-direction profile of the calendering nip pressure.
  • a normal drying cylinder 20a with a cast-iron mantle is adequate.
  • both of the rolls/cylinders that form the NK nips at the calendering nip can be provided with heating and/or with regulation of the temperature profile or level in view of regulation of the profile of linear load in the nip NK;NKP or nips.
  • the axle journals of the calender roll 10 are connected with power units in themselves known, which are not shown and by whose means the nip-pressure loading of the calendering nip NK;NKP is produced.
  • the fitting of a calendering nip NK;NKP or nips in the dryer section does not increase the length of the dryer section, but the drying capacity of the dryer section is slightly increased or at least remains unchanged irrespective of the location of the calendering nip NK;NKP or nips.
  • the invention is also suitable for use in modernizations of paper machines, in which case, with slight modification work, it is possible to place one or several nips NK;NKP of intermediate calendering in suitable locations in the dryer section.
  • the present invention when the present invention is applied, it is possible to omit the machine stack, for example a soft calender, completely, in which case the length of the dryer section can be increased with the space that was occupied by the machine stack and, thus, the drying capacity can be increased, for example, when the running speed of a paper machine is increased in connection with modernization.
  • the machine stack for example a soft calender
  • a calender roll 10 provided with a soft coating 10' is used, so that a so-called soft calender nip is fitted in different positions in accordance with the present invention.
  • the hardness of the coating 10' of the calender roll 10 is preferably chosen in the range of 80...95 Shore D, preferably in the range of 88...92 Shore D.

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  • Drying Of Solid Materials (AREA)

Claims (16)

  1. Section de séchage d'une machine à papier dans laquelle sont disposés plusieurs groupes de toiles en succession (R) qui principalement ou exclusivement sont des groupes (R1...Rv) avec un tirage de toile unique ou circulation monotoile, dans laquelle les cylindres de séchage chauffés (20, 20a) sont placés dans la rangée supérieure, et les cylindres d'aspiration d'inversion (30, 30a) ou les rouleaux d'aspiration d'inversion équivalents (30aa) sont placés dans la rangée inférieure et groupes qui (R1...Rv), avec la circulation monotoile, comprennent une toile de séchage (21) qui se déplace le long d'un trajet sinueux sur lesdits cylindres de séchage (20, 20a) et les cylindres d'aspiration d'inversion (30, 30a) ou les rouleaux (30aa), de telle sorte que lesdits cylindres ou rouleaux d'aspiration d'inversion demeurent à l'intérieur de la boucle de la toile de séchage (21), section de séchage dans laquelle, en liaison avec un cylindre de séchage (20a) de l'un desdits groupes à circulation monotoile, un espace libre a été disposé dans lequel est ajusté un rouleau de calandrage (10 ; 10P) qui est agencé de façon à former une emprise ou interstice (NK ; NKP) de calandrage intermédiaire, conjointement avec le cylindre de séchage cité en dernier (20a), à travers l'interstice duquel la bande continue de papier (W) à sécher est acheminée et, ainsi, calandrée à l'intérieur de la section de séchage, caractérisée en ce que l'interstice de calandrage (NK ; NKP) a été disposé en liaison avec un cylindre de séchage non latéral (20a) à l'intérieur du groupe (Rv, Rn, Rn-1) avec une circulation monotoile ou en liaison avec le dernier cylindre de séchage du groupe (Rv, Rn, Rn-1) avec une circulation monotoile, et la bande continue de papier (W) est agencée de façon à être en contact avec ledit rouleau de calandrage (10 ; 10P) uniquement dans l'interstice de calandrage (NK ; NKP), après quoi la bande continue (W) est séparée dudit rouleau de calandrage.
  2. Section de séchage selon la revendication 1, caractérisée en ce que l'interstice de calandrage (NK ; NKP) a été agencé en liaison avec le dernier cylindre de séchage (20a) dans le dernier de l'un desdits groupes (R1...Rv) avec circulation monotoile dans la section de séchage dans la zone du dernier quart supérieur dudit cylindre (20a) et en ce qu'après l'interstice de calandrage (NK ; NKP), la toile (W) est amenée (Wout) à un dispositif de finissage tel qu'une enrouleuse.
  3. Section de séchage selon la revendication 1, caractérisée en ce que l'interstice de calandrage (NK ; NKP) a été agencé entre deux groupes successifs desdits groupes (R1...Rv) avec une circulation monotoile en liaison avec le dernier cylindre de séchage (20a) dans le premier groupe, avant l'interstice de calandrage (NK ; NKP), en guidant la toile de séchage (21) du premier groupe (Rn-1) au moyen d'un rouleau de guidage (22a, 22ap), séparé du dernier cylindre de séchage (20a) de sorte que l'on a un espace pour l'interstice de calandrage (NK ; NKP) entre les toiles de séchage(21) des groupes successifs (Rn-1, Rn).
  4. Section de séchage selon la revendication 1, caractérisée en ce que l'interstice (NK) de calandrage intermédiaire a été agencé en liaison avec un cylindre de séchage non latéral (20a) à l'intérieur du groupe (Rn) avec une circulation monotoile en guidant la toile de séchage (21) séparément de la bande de papier continue (W) à sécher et calandrer et en fournissant un rouleau de calandrage (10) en liaison avec la face de bande de papier continue (W) rendue ainsi libre, rouleau de calandrage (10) qui forme un interstice (NK) de calandrage intermédiaire avec ledit cylindre de séchage (20a).
  5. Section de séchage selon l'une quelconque des revendications 1 à 4, caractérisée en ce que le matériau de surface de la face de cylindre (10') du rouleau de calandrage (10) a été choisi de telle sorte qu'après l'interstice de calandrage (NK), la bande continue de papier (W) suit le cylindre de séchage (20a).
  6. Section de séchage selon la revendication 1, caractérisée en ce qu'elle comprend, après une portion initiale dotée desdits groupes (R1...Rv) avec circulation monotoile, un ou plusieurs, de préférence un groupe (R2W) avec circulation à deux toiles, dans lequel sont prévues deux rangées de cylindres de séchage chauffés (20A, 20B) entre lesquelles la bande continue W a des circulations non supportées (Wp), et l'interstice de calandrage (NK) a été agencé en liaison avec le dernier cylindre de séchage chauffé (20a) du groupe (Rv) avec circulation monotoile précédant le groupe (R2W) avec circulation à deux toiles, lequel interstice est formé par le cylindre de séchage mentionné en dernier (20a) conjointement avec un rouleau de calandrage (10) à face lisse (10') qui est placé à proximité du plan horizontal du centre de rotation dudit cylindre de séchage (20a), et la bande de papier continue (W) à sécher est, après avoir traversé l'interstice de calandrage (NK), amenée comme circulation libre (Wp1) sur le premier cylindre de séchage inférieur (20B) dans le groupe (R2W) avec circulation à deux toiles comme circulation inclinée vers le bas.
  7. Section de séchage selon l'une quelconque des revendications 1 à 6, caractérisée en ce qu'une boucle de courroie de calandrage (11) a été disposée pour s'acheminer entre l'interstice de calandrage (NK), laquelle courroie est guidée par un rouleau de guidage (12) ou des rouleaux de guidage.
  8. Section de séchage selon l'une quelconque des revendications 1 à 7, caractérisée en ce que le rouleau de calandrage (10) dans un interstice (NK) de calandrage intermédiaire, un rouleau de calandrage muni d'un revêtement dur ou mou (10') est utilisé, et en tant que rouleau d'appui un cylindre de séchage (20a) est utilisé, cylindre qui est normal ou qui est muni d'un renforcement spécial.
  9. Section de séchage selon l'une quelconque des revendications 1 à 8, caractérisée en ce que la charge linéaire qui est utilisée dans l'interstice de calandrage (NK) ou les interstices à l'intérieur de la section de séchage a été choisie en fonction de la qualité de papier à produire, de la teneur en matières solides sèches de la bande continue (W) à calandrer, ou dans d'autres circonstances, dans la plage de 0...300 kN/m, de préférence dans la plage de 0...80 kN/m.
  10. Section de séchage selon l'une quelconque des revendications 1 à 9, caractérisée en ce que la température de surface (T) du cylindre de séchage (20a) qui contribue à former l'interstice de calandrage (NK ; NKP) ou les interstices à l'intérieur de la section de séchage a été fixée ou régulée dans la plage de T ≈ 60...250°C.
  11. Section de séchage selon la revendication 8, caractérisée en ce que la dureté du revêtement mou (10') du rouleau de calandrage (10) qui forme l'interstice de calandrage (NK) conjointement avec le cylindre de séchage (20a) a été choisie dans la plage de 80...95 Shore D, de préférence dans la plage de 88...92 Shore D, pour former ce qu'il est convenu d'appeler un interstice de calandrage doux (NK) à l'intérieur de la section de séchage.
  12. Section de séchage selon l'une quelconque des revendications 1 à 11, caractérisée en ce que l'on utilise un interstice allongé (NKP) en tant qu'interstice unique ou plusieurs interstices de calandrage intermédiaires.
  13. Section de séchage selon la revendication 12, caractérisée en ce que l'interstice allongé (NKP) a été formé entre un cylindre de séchage (20a) et un rouleau à tuyau flexible (10P) muni d'une enveloppe de tuyau flexible (10P'), un sabot de coulissement chargé hydrauliquement ou une série de sabots de glissement (27) agencés à l'intérieur de ladite enveloppe de tuyau flexible (10P') au moyen desquels il est produit une pression d'interstice dans la zone de calandrage de l'interstice allongé (NKP), et en ce que les deux extrémités verticales de la boucle de ladite enveloppe de tuyau flexible (10P') sont fermées.
  14. Section de séchage selon la revendication 13, caractérisée en ce que le profilé de la charge linéaire dans l'interstice allongé (NKP) est commandé dans la direction de la machine et/ou dans la direction transversale en régulant la charge hydraulique de la série desdits sabots de glissement (27).
  15. Section de séchage selon l'une quelconque des revendications 1 à 14, caractérisée en ce qu'avant l'interstice de calandrage (NK ; NKP), à proximité de la face libre de la bande continue (W) et/ou en liaison avec le rouleau de calandrage (10), il a été agencé un dispositif (28 ; 28') qui intensifie l'effet de calandrage dans l'interstice de calandrage consécutif (NK ; NKP) tel qu'une caisse de fourniture de vapeur, un élément chauffant à infrarouge ou un dispositif équivalent pour le profilage, le chauffage de la bande continue et/ou la pulvérisation de brouillard d'eau.
  16. Section de séchage selon la revendication 15, caractérisée en ce que l'humidité en direction transversale, la température et/ou le ou les profil(s) de charge linéaire de l'interstice de calandrage (NK ; NKP) est/sont régulé(s) au moyen dudit dispositif (28 ; 28') qui intensifie l'effet de calandrage et/ou au moyen d'un dispositif de chauffage séparé équivalent.
EP97904468A 1996-02-28 1997-02-11 Sections de sechage d'une machine a papier, permettant un calandrage intermediaire Expired - Lifetime EP0824618B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01129060A EP1195464A3 (fr) 1996-02-28 1997-02-11 Section de séchage avec calandrage intermédiaire dans une machine à papier

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI960925A FI104434B (fi) 1996-02-28 1996-02-28 Välikalanteroinnilla varustetut paperikoneen kuivatusosat
FI960925 1996-02-28
PCT/FI1997/000084 WO1997032080A1 (fr) 1996-02-28 1997-02-11 Sections de sechage d'une machine a papier, permettant un calandrage intermediaire

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP01129060A Division EP1195464A3 (fr) 1996-02-28 1997-02-11 Section de séchage avec calandrage intermédiaire dans une machine à papier

Publications (2)

Publication Number Publication Date
EP0824618A1 EP0824618A1 (fr) 1998-02-25
EP0824618B1 true EP0824618B1 (fr) 2002-07-10

Family

ID=8545549

Family Applications (2)

Application Number Title Priority Date Filing Date
EP97904468A Expired - Lifetime EP0824618B1 (fr) 1996-02-28 1997-02-11 Sections de sechage d'une machine a papier, permettant un calandrage intermediaire
EP01129060A Withdrawn EP1195464A3 (fr) 1996-02-28 1997-02-11 Section de séchage avec calandrage intermédiaire dans une machine à papier

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP01129060A Withdrawn EP1195464A3 (fr) 1996-02-28 1997-02-11 Section de séchage avec calandrage intermédiaire dans une machine à papier

Country Status (9)

Country Link
US (1) US5894679A (fr)
EP (2) EP0824618B1 (fr)
JP (1) JPH11504401A (fr)
KR (1) KR100321606B1 (fr)
AT (1) ATE220434T1 (fr)
CA (1) CA2217678A1 (fr)
DE (2) DE824618T1 (fr)
FI (1) FI104434B (fr)
WO (1) WO1997032080A1 (fr)

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EP2549013A1 (fr) * 2011-07-21 2013-01-23 Metso Paper, Inc. Procédé et agencement pour produire une bande de materiau fibreux

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US6065222A (en) * 1996-02-28 2000-05-23 Valmet Corporation Dryer sections with intermediate calendering in a paper machine
FI104100B1 (fi) 1998-06-10 1999-11-15 Valmet Corp Integroitu paperikone
FI104001B1 (fi) 1998-06-26 1999-10-29 Valmet Corp Kuivatusosa
DE69922041T2 (de) 1998-08-04 2005-10-13 Metso Paper, Inc. Verfahren und vorrichtung zur behandlung von papier oder pappebahnen
US6332953B1 (en) 1998-10-02 2001-12-25 International Paper Company Paper product having enhanced printing properties and related method of manufacture
FI991096A (fi) 1999-05-12 2000-11-13 Valmet Corp Menetelmä paperin, erityisesti hienopaperin, valmistamiseksi ja paperi konelinja erityisesti hienopaperin valmistamista varten
FI105118B (fi) 1999-05-12 2000-06-15 Valmet Corp Menetelmä paperi- tai kartonkirainan valmistamiseksi ja paperi- tai kartonkikone
SE517618C2 (sv) * 1999-10-27 2002-06-25 Stora Kopparbergs Bergslags Ab Anordning och metod i samband med tillverkning av papper eller kartong
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US6946186B2 (en) * 2002-08-24 2005-09-20 International Paper Co. Uncoated facestock for adhesive-backed labels
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US8176650B2 (en) * 2005-12-13 2012-05-15 Kimberly-Clark Worldwide, Inc. Method for warming up or cooling down a through-air dryer
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Also Published As

Publication number Publication date
DE69713839D1 (de) 2002-08-14
FI960925A0 (fi) 1996-02-28
KR19980703709A (ko) 1998-12-05
US5894679A (en) 1999-04-20
KR100321606B1 (ko) 2002-12-02
CA2217678A1 (fr) 1997-09-04
DE69713839T2 (de) 2002-11-21
JPH11504401A (ja) 1999-04-20
EP1195464A3 (fr) 2002-07-10
EP1195464A2 (fr) 2002-04-10
EP0824618A1 (fr) 1998-02-25
ATE220434T1 (de) 2002-07-15
FI960925A (fi) 1997-08-29
FI104434B (fi) 2000-01-31
DE824618T1 (de) 1998-05-28
WO1997032080A1 (fr) 1997-09-04

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